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Letters Patent No. 70,792, dated November 12, 18H7.

HOUSE-VENTILATOR.

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TO ALL WHOM IT MAY CON CERN:

Be it known that I, ROBERT BOYD, ofEvansville, in the county of Vanderburg, and State of Indiana, have invented a new and improved House-Ventilator; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable those skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part of this specication.

This invention relates to an improved method of Ventilating dwelling-houses, halls, hospitals, and public buildings, whereby the fresh air from the outside may be conveyedl inside, and the vitiated or foul air escape therefrom; and the invention consists in arranging aventilator in the wall, whose apertures are opened and closed by a valve-cylinder, by which the ingress and egress of air-to and from the rooms of dwelling-houses, hospitals, or halls may be regulated, as will be hereinafter more fully described.

Figure 1 represents a vertical section of the wall, with my ventilator attached, -with the apertures arranged for the escape of the foul air from a room.

Figure 2 i's the same, arranged for the admission of pure air into the room, both sections being through the line :v :v of g.

Figure 3 is a front-view of the ventilator, partly in section.

Similar letters of reference indicate corresponding parts.

The ventilator is formed of two metallic cylinders, secured in a metallic frame, and of suitable size. The outer cylinder is attached to the frame, and is stationary, and has three longitudinal apertures through it for tbc passage of the air. The inner cylinder is designed to t the outer one, but to turn in it freely, and it has two longitudinal Iapertures through it. By turning this cylinder those apertures or openings are made to regis? ter or correspond with two of theo'penings of the outer'cylinder, or, if desired, to close either two of them.

A represents tbe frame, which is set in the wall. B is the outer` cylinder. C is the inner cylinder. This inner cylinder has a segment of a wheel attached to one vend, which is seenin gs. 1 and 2 in dotted lines, and an edge viewis seen in iig. 3. This segment is marked I). E is a tubular section or flue, which fits onto the neck of the outer cylinder, as seen at a a. This section of ailue is thus placed for the purpose of'. conducting either pure or foul air to or from the room, and may -be connected with a Hue under the floor, and communicate with the room by a register through the door, as seen in the drawing in red lines. l

As seen in the drawing, Eg 1, the cylinder() is so adjusted' that air is escaping from the bottom of the room through the ventilator, and up the ue in the wall, as indicated by the arrows. In g. 2, the cylinder C is so adjusted that fresh or pure air is passing in through the ventilator, from the outside, and into the room through the floor, as indicated by the arrows. In this tubular section E there is a valve, seen at F, which may be thrown back, so as to close the tube E and open a passage for the air directly from tho upper portion of the room; and it will be seen that pure air may be admitted into the roomin the same way.

In ordinary cases the tube E might be dispensed with, but to properly ventilate hospitals and large halls, it is necessary to have a communication'with a passage-way under the door, as represented. This part E is readily detached when it is not desired to use the saine.

Referring again to the outer cylinder I3, the 'manner of its connection with tho frame is readily seen. Gi

is the opening for the pure air from without. H is the throat, or the opening through which both pure and foul air pass, and J is the opening through which the foul air escapes into the ilue in the wall.

I do not confine myself to this particular method of closing and opening the passages G, H, and J. I am aware that it may be done by separate valves. i

But having thus described'my invention, I claim as new, andidesire to secure by Letters Patent- 1. A ventilator so constructed that pure airmay pass into the room, and foul or impure air maybe passed therefrom, substantially in the manner herein shown and described.

2. The outer vcylinder B, with the openings G, II, and J, and the frame A, combined and arranged substantially as described. p

8. The inner cylinder C, or its equivalent, arranged and operating substantially as and for the purpose setfortlr.

ROBERT BOYD, Witnesses J. A. LEMCKE, S. K. Lnavrrr, 

